Benefit Plans - Qualified and Non-Qualified Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022
Pension
Defined Benefit Plan Disclosure [Line Items]
Net actuarial (gain) loss	$ (7,596)	$ 19,777
Amortization of prior service cost	(135)	(135)
Amortization of actuarial (loss) gain	(58)	(1,000)
Total recognized in other comprehensive loss	(7,789)	18,642
Total recognized in net periodic benefit (income) cost and other comprehensive (income) loss (before tax)	(21,465)	4,292
OPEB
Defined Benefit Plan Disclosure [Line Items]
Net actuarial (gain) loss	(161)	(976)
Amortization of prior service cost	0	0
Amortization of actuarial (loss) gain	54	95
Total recognized in other comprehensive loss	(107)	(881)
Total recognized in net periodic benefit (income) cost and other comprehensive (income) loss (before tax)	$ 118	$ (802)

Amount recognized in net periodic benefit cost (credit) and other comprehensive (income) loss.

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Amount, before tax, after reclassification adjustment, of increase (decrease) in accumulated other comprehensive income from gain (loss) of defined benefit plan.

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Amount, before tax, of gain (loss) for (increase) decrease in value of benefit obligation for change in actuarial assumptions and increase (decrease) in value of plan assets from experience different from that assumed of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.

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